We encountered a case of Dor's operation for left ventricular aneurysm with cardiac failure 19 years after operation for post-infarction ventricular septal perforation. A 70-year-old man, who had undergone patch closure for ventricular septum perforation due to acute anteroseptal myocardial infarction, was admitted for congestive heart failure. Preoperative left ventriculography (LVG) revealed large anteroseptal and ventricular septal aneurysm. The left ventricular ejection fraction (LVEF) was 39%, and the left ventricular end diastolic volume (LVEDV) was 200ml. Dor's operation and coronary artery bypass grafting to the left circumflex branch was performed. The postoperative course was uneventful and the patient was discharged 33 days after the operation. Postoperative LVG revealed improved left ventricular function and showed that LVEF was 45% and LVEDV was 171ml. The large akinetic aneurysm was formed 19 years after operation following the linear closure method. LVG after Dor's operation showed remarkable improvement for left ventricular function. These findings indicated that Dor's operation is superior to the linear method.